128575231 has 2 divisors, whose sum is σ = 128575232. Its totient is φ = 128575230.

The previous prime is 128575207. The next prime is 128575247. The reversal of 128575231 is 132575821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128575231 - 2⁷ = 128575103 is a prime.

It is a super-2 number, since 2×128575231² = 33063180053406722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128575331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64287615 + 64287616.

It is an arithmetic number, because the mean of its divisors is an integer number (64287616).

Almost surely, 2^128575231 is an apocalyptic number.

128575231 is a deficient number, since it is larger than the sum of its proper divisors (1).

128575231 is an equidigital number, since it uses as much as digits as its factorization.

128575231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 34.

The square root of 128575231 is about 11339.1018603768. The cubic root of 128575231 is about 504.7222352505.

The spelling of 128575231 in words is "one hundred twenty-eight million, five hundred seventy-five thousand, two hundred thirty-one".